The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1990
Filed:
Jan. 09, 1989
Applicant:
Inventors:
Akira Ito, Atsugi, JP;
Mizuo Okada, Yokohama, JP;
Assignee:
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
350128 ;
Abstract
Provided is a rear projection screen formed with entrance lenses on a light receiving side of the screen and exit lenses on a light emanating side of the same for transmitting light rays from the entrance lenses to the exit lenses, wherein the central portion of the entrance lens is so shaped as to have a focal point locating on or near the exit lens surface, and the side portions of the entrance lens are so shaped as to have a focal point or points remote from the entrance lens than the focal point for the central portion.